On Sun, 2 Mar 2008, Gabor Grothendieck wrote:
> You can do this: > > Lines <- "A,B > 1,2 > 3,4" > DF <- read.csv(textConnection(Lines)) > > which is slightly simpler than the examples there. Thank you Gabor, I made it even simpler by replacing the Lines object with a string contstant. It works perfectly well for me. Cheers, --Gene > On Sun, Mar 2, 2008 at 5:59 PM, Gene Selkov <[EMAIL PROTECTED]> wrote: >> Hi Dirk, >> >> I didn't at first pay attention to your comment about littler, as my >> original problem of plotting to stdout was solved. But it was just part of >> the larger problem: I actually need to be piping the data with the code >> for making the picture in, and getting the picture out without opening any >> files. This is to be run in a server environment, where the use of temp >> files is not really acceptable. >> >> Having solved half of the problem, I feel cornered again, because I >> haven't found a nice way of mixing code and data in R. >> >> I am aware that this issue was brought up before; I am not sure I like the >> solutions suggested, because they involve the R language parsing and >> interpreting for each data row -- if I understand correctly. >> >> http://tolstoy.newcastle.edu.au/R/help/03a/6750.html >> >> Are these solutions the best currently available? That thread is almost 5 >> years old now. >> >> Let me give you an example of what I would like to be possible: >> >> In postgres, I can read this from stdin: >> >> CREATE TABLE remark ( >> "case" smallint, >> text text >> ); >> >> COPY remark ("case", text) FROM stdin; >> 877 lymph node biopsy >> 909 Unresectable mass in the body of the pancreas >> \. >> >> ... more SQL .... >> >> It allows the "code" and "input" chunks to be mixed, because the >> input for stdin is always terminated by a special token, '\.', and so the >> parser can skip the data chunks without interpreting them. >> >> Almost similarly, perl has the __DATA__ token, that allows a portion of >> text within a program to be treated as stdin. >> >> I wonder whether anything like this is possible in R or littler. >> >> >> Thanks, >> >> --Gene >> >> >> On Fri, 7 Sep 2007, Dirk Eddelbuettel wrote: >> >>> On Fri, Sep 07, 2007 at 02:27:00PM -0400, Duncan Murdoch wrote: >>>> On 9/7/2007 2:15 PM, Gene Selkov wrote: >>>>> Thanks a ton, Duncan! >>>>> >>>>> So I have verified that this line works: >>>>> >>>>> echo "postscript(file=\"\", command=\"cat\"); plot(0)" | r --vanilla >>>>> --slave >>>>> >>>>> Wonderful! (albeit a little unobvious) >>>> >>>> I would include an explicit "dev.off()" after the plotting; I'm not sure >>>> all devices guarantee a clean shutdown when R quits. >>> >>> And for the record, both littler and Rscript can do that without the >>> need for double quotes, at least under Linux. E.g. both >>> >>> $ r -e 'postscript(file="", command="cat"); plot(0)' | head >>> $ Rscript -e 'postscript(file="", command="cat"); plot(0)' | head >>> >>> provide the same output (of the beginning of the postscript output). >>> Our r is as usual somewhat faster, not that this matters in this >>> non-repeat context. >>> >>> Dirk >>> >>> -- >>> Three out of two people have difficulties with fractions. >>> >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
